スジアイナメ卵巣組織の周年変化〔英文〕

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Histological observations were carried out on the ovaries of masked greenling Hexagrammos octogrammus collected in Usujiri, southern Hokkaido, Japan, for the purpose of clarifying the annual reproductive cycle and the first maturational process.The development of ovaries during maturation was divided into the following six phases;(1) recovery phase (immature phase in case of under-spawners), (2) pre-vitellogenic phase, (3) vitellogenic phase, (4) maturing phase, (5) early spawning phase, (6) late spawning phase.The vitellogenic phase proceeded for a single month (mid August-mid September), as did the spawning phase (late September-late October).There were three characteristic features in the mode of oocyte development. The first feature was the transference from the peri-nucleolus stage to the yolk vesicle stage had finished when the most advanced oocytes in an ovary were at the migratory nucleus stage. Second, the maturing through the migration of nucleus to the ovulation progressed intermittently as a clutch. The third feature was oocytes at the oil droplet stage, the early yolk globule stage and the late yolk globule stage began degenerating while the last clutch in this spawning period was at the pre-mature or more developing stage.
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